Drop mass transfer in a microfluidic chip compared to a centrifugal contactor

Abstract

A model system was developed for enabling a multiscale understanding of centrifugal-contactor liquid-liquid extraction. The system consisted of Nd(III) 1 xylenol orange in the aqueous phase buffered to pH 5 5.5 by KHP, and dodecane 1 thenoyltrifluroroacetone (HTTA) 1 tributyphosphate (TBP) in the organic phase. Diffusion constants were measured for neodymium in both the organic and aqueous phases, and the Nd(III) partition coefficients were measured at various HTTA and TBP concentrations. A microfluidic channel was used as a high-shear model environment to observe mass transfer on a droplet scale with xylenol orange as the aqueous-phase metal indicator; mass-transfer rates were measured quantitatively in both diffusion and reaction limited regimes on the droplet scale. The microfluidic results were comparable to observations made for the same system in a laboratory scale liquid-liquid centrifugal contactor, indicating that single drop microfluidic experiments can provide information on mass transfer in complicated flows and geometries.

Misbehavior detection and efficient revocation within VANET

“…Nichols et al [55] determined mass flow rates of 13 lanthanides and yttrium using a Teflon capillary to generate a segmented flow between an aqueous phase (diethylenetriaminepenta acetic acid and ammonium citrate) and an organic phase containing the extractant acid di-(2-ethylhexyl)phosphoric (HDEHP). A system that mimics the TRUEX (TRansUranium EXtraction) [69] liquid-liquid extraction process was studied in a flow-focusing junction by Nemer et al [70]. The extraction of neodymium (Nd 3+ ) from aqueous droplets to dodecane using the complexant thenoyltrifluoroacetone 8 (HTTA) and ligand TBP was chosen as a mass-transfer system model.…”

Selective Extraction of ECG from Tea Polyphenols by One Step in Centrifugal Contactor Separators: Modeling and Application

“…Centrifugal extraction technology uses centrifugal force to achieve liquid–liquid two-phase contact mass transfer and separation . Centrifugal contactor separator possesses good mass transfer characteristics and can be utilized to separate two liquid phases with small density difference .…”

Design Guideline for Passive Microextractors: From Cocurrent Flow to Countercurrent Flow

“…Microfluidics has proven to be a rapid, low-cost, and high-efficiency technology in many fields, such as analysis, synthesis, separation, and pelleting . Microextraction is used to perform liquid–liquid solvent extraction in microscale contactors, i.e., microextractors, and has been proven highly efficient for multiple-component separation. − Microextractors can be classified into two main types: active microextractors and passive microextractors. Unlike active microextractors, passive microextractors achieve extraction by relying solely on specially designed microchannel configurations, without any moving parts or external energy input .…”